Composition of matter



Patented Apr. 2, 1935 UNITED STATES 1,996,711 COMPOSITION OF MATTER Enrique G. Touceda, Albany, N. Y., assignor to Consolidated Albany, N. Y.,

Car-Heating Company, a corporation of New York Inc.,

l qo Drawing. Application'February 21, 1934,

Y Serial N0, 712,312

4 Claims.

This invention relates to a composition of matter, especialyto a composition of matter known a; an alloy, more particularly to a non-ferrous a oy.

Heretofore, dentures and dental bridges and like structures have often been constructed by employing the so-called noble metals, such as, for instance, gold and platinum. These metals are quite expensive and, consequently, considerable advantage would be gained if some .of the relatively inexpensive metals could be used as a substitute for the noble metals.

A substitute for the noble metal in the construction of the devices mentioned must necessarily possess some of the outstanding characteristics of the noble metals, that is, such substitute must be susceptible of a high polish, be untarnishable and incorrodable when in contact with the complex media in the human mouth, as saliva, food, or drink, and be of a nature such that additions and changes may be made to a substantially finished device by soldering portions of the same metal thereto or joining by other means, such as welding.

A principal object of this invention is to provide a substitute for the noble metals, in those devices which must be made of a substance which is susceptible to taking a high polish, is untarnishable and incorrodable, and which is rapidly unitable with another portion of the same metal by the common solders usually employed by dental workers such, for instance, as the so-called silver solders and gold solders, or by welding.

Non-ferrous alloys containing cobalt, chromium and tungsten possess the advantage of a relatively low cost as compared with the cost of noble-metals, and in addition, are susceptible of a high polish comparable to that of the noble metals, and are also untarnishable and inconodable by contact with ordinary atmospheric conditions and by the moisture conditions to which a denture is subjected. Such an alloy, however, is not susceptible of treatment and manipulation in the same way as the noble metals because two portions of such an alloy may not be soldered together by the common soldering metals ordinarily used by dental workers, such as silver and gold solder.

Applicant has discovered that he can make an alloy which possesses desirable characteristics of the noble metals and the characteristics of a cobalt, chromium, tungsten alloy, and in addition is of such a nature that two portions thereof may be soldered together by the use of the ordinary silver and gold solders; commonly used by dental workers by the addition of titanium to the cobalt chromium tungsten alloy.

Applicant has further found that although the alloy so produced is one of extremely high melting 'point, its fluidity when melted is greatly im- 5 proved by the addition thereto of silicon, and the mechanical properties of the solid alloy. are materially enhanced.

Applicant has found that the best proportions for 'an alloy suitable for, the purpose indicated is about as follows: chromium 28 to 36 parts; cobalt 50 to 60 parts; tungsten 2 to 5 parts; silicon 1 to 3 parts; titanium, added as a mixture of titanium and manganese having about 30 to 35% titanium and 60 to 65% manganese, from 6 to 10 parts. I

An actual alloy was composed of substantially the following:

' Parts Chromium 32 Cobalt 5'7 Tungsten 2 Silicon 1 Titanium manganese 8 The main'base of the alloy is chromium and cobalt. As in the alloys of the prior art, tungsten is added but in a less quantity than is .usually placed in those alloys. The amount of titanium present in the alloy is such that it gives the desired soldering properties. The silicon is in an amount suflicie'nt tosufficiently aid the fluidity of the mixture when subjected to the proper melting temperature.

Applicant has found that a preferred method of adding the titanium to the alloy is by introducing it as an alloy of titanium and manganese. The usual proportions of the alloy added are about 30 to 35% titanium and from 60 to 65% manganese. 40

Applicant's alloy has a melting point of about 3200 C. When cast it is of a hardness such that it is what is known commonly as file hard, but is, however, suificiently flexible and when polished has abright surface characteristic of noble metals and a color somewhat akin to but not as white as platinum.

When melting the alloy of applicants invention one should avoid the use of any apparatus for holding the alloy which is capable of giving up u the addition, of carbon I I carbon to the alloy because to applicants alloy is undesired because it. gives it an entirely unwanted hardness and brittleness.

Applicant's alloy is not only useful for making articles as dentures and analogous structures but 66 j is also of use in the manufacture of jewelry and such devices as extrusion dies which have to re- 7 main incorrodable and untarnishable even when heated by the extrusion of the hot metal therethrough.

Although applicant has described one particular physical embodiment of his invention, .and described the proportions of the best form of his alloy, nevertheless, it is to be understood that the proportions set forth are merely illustrative but do not exhaust other possible proportions of ingredients by which an alloy of the character described is obtained.

What is claimed as new and desired to secure by Letters Patent of the United States, is:

1. An alloy consisting of about 32 parts of chromium, 57 parts of cobalt, 2 parts of tungsten,

1 part of silicon, and about 5 parts of manganese and about 3 parts of titanium.

2. An alloy consisting of about 28 to 36 parts of chromium,,50 to 60 parts of cobalt, 2 to 5 parts of tungsten, 1 to 3 parts of silicon, and 2 to 4 parts of titanium, and 4 to 6-parts of manganese.

3. A denture formed of an alloy consisting of about 32 parts of chromium, 57 parts of cobalt, 2 parts of tungsten, 1 part of silicon, and about 5 parts of manganese and about 3 parts of titanium.

4. A denture formed of an alloy consisting of about 28 to 36 parts of chromium, 50 to 60 parts of cobalt, 2 to 5 parts of tungsten, 1 to 3 parts of silicon,'and 2 to 4 parts of titanium and 4 to 6 parts of manganese.

ENRIQUE G. TOUCEDA. 

